TAILIEUCHUNG - Báo cáo sinh học: " Genetic effects of static magnetic fields. Body size increase and lethal mutations induced in populations of Drosophila melanogaster after chronic exposure"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Genetic effects of static magnetic fields. Body size increase and lethal mutations induced in populations of Drosophila melanogaster after chronic exposure | Genet Sei Evol 1992 24 393-413 Elsevier INRA 393 Original article Genetic effects of static magnetic fields. Body size increase and lethal mutations induced in populations of Drosophila melanogaster after chronic exposure G Giorgi1 D Guerra1 c Pezzoli1 s Cavicchi1 F Bersani2 1 Department of Evolutionary and Experimental Biology Bologna 2 Department of Physics University of Bologna 40126 Bologna Italy Received 9 August 1991 accepted 5 June 1992 Summary - The effect of static magnetic fields on body size of Drosophila melanogaster was analyzed on 3 laboratory stocks reared under chronic exposure to a magnetic field 10-12-fold greater than the earth s. A significant increase in body size was observed which persisted even when the flies were returned to control environmental conditions after a few generations of exposure. The genetic basis of the differences observed between treated and control lines was assessed analyzing 2 fitness components and 4 dimensional characters. The increase in body size was mainly associated with cell number suggesting that the magnetic field effect on size depends on genes which control cell proliferation. The evolution of the fitness components during the generations of exposure gives some evidence of the underlying genetic mechanisms involved. Lines made isogenic for the 3 major chromosomes were tested to establish whether the size response obtained was dependent on the genetic variability or not. These lines behaved in a similar fashion to outbred lines suggesting that the response in size depends on an increased mutation rate. A mutagenic test confirmed that one generation of exposure induces X-linked lethal mutations. These events could reflect the fact that the magnetic field acts as a physical mutagenic agent at some stage during development. Drosophila melanogaster magnetic field lethal mutation body size cell proliferation Resume - Effet génétique des champs magnétiques statiques augmentation de la taille corporelle et mutations .

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